bci2000.org BBS

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// This segment of code will search a UDP packet for a '(' and then determine 
// if its reading the X or Y mouse movement vector by the 0 or 1 that follows. 
// It writes an 'x' or 'y' to the signal transmit buffer which will be used by 
// the MCU to differentiate between X and Y signals. It then writes characters 
// 12 though 17 to the buffer which are the mouse signals. E.G. x-0.123y1.2345 
// and then outputs the signal via serial. The MCU is only interested in the
// first three decimal places. When the number is positive, it will not have
// a negative sign and thus have a fourth decimal place, this is discarded
// by the MCU but permits a static string length for this program.

	while(1){
		if(getline(udpIn,line)){					// UDP Packet Input
			transPos=0;								// reset trans position
			buffOut=0;								// reset out buffer length
			sig="#######";							// reset signal string
			readLen=line.length();					// length of UDP info
			for(readPos=0;(readPos<=readLen)&&(!transPos);readPos++){
				if((line[readPos]=='(')){			// Found mouse vector
					if(line[readPos+1]=='0')		// Found X signal
						sig[0]='x';					// Write x to trans buffer
					if(line[readPos+1]=='1')		// Found Y signal
						sig[0]='y';					// Write y to trans buffer
					transPos++;						// Increment trans buffer
					for(readPos=min;readPos<=limit;readPos++){ // Read signal
						sig[transPos]=line[readPos];// Write to trans buffer	
						transPos++;					// Increment trans buffer
					}					
					buffOut=sig.length();			// Determine serial buffer
					sendData(sig.c_str(),buffOut);			// Serial Output				
					//cout << "BCI2K Out: " << sig << endl;	// Display Progress
				}
			}
		}	
	}